allow subregions of globe to be plotted for 'ortho' and 'geos'
fixes for setup.py on windows
turned off wx extension code by default
small cleanups
print srs instance variable for each map, add geostationary example.
cleanup mapboundary method.
updates to memleak script
preparing for 0.90.1
added labelstyle keyword to drawparallels and drawmeridians.
added 'labelstyle' keyword to drawparallels and drawmeridians.
